I will not be alive to see any answers.  It takes many years to get
an objective evaluation of any issue.

As I find out more,  I find some of our heros were very despicable
people.

In any case, the history is written by the winner.

My hero is the beast of my enemies.

The solution may be a large asteroid
coming in.   Then mother nature could
start over and maybe  be more successful
on the next try.